diff --git a/README.md b/README.md
index c2ef43e9c..83ba1feef 100644
--- a/README.md
+++ b/README.md
@@ -319,32 +319,7 @@ module.exports = {
 };
 ```
 
-The `options` object contains the following:
-
-```tsx
-export interface TsdxOptions {
-  // path to file
-  input: string;
-  // Name of package
-  name: string;
-  // JS target
-  target: 'node' | 'browser';
-  // Module format
-  format: 'cjs' | 'umd' | 'esm' | 'system';
-  // Environment
-  env: 'development' | 'production';
-  // Path to tsconfig file
-  tsconfig?: string;
-  // Is error extraction running?
-  extractErrors?: boolean;
-  // Is minifying?
-  minify?: boolean;
-  // Is this the very first rollup config (and thus should one-off metadata be extracted)?
-  writeMeta?: boolean;
-  // Only transpile, do not type check (makes compilation faster)
-  transpileOnly?: boolean;
-}
-```
+The `options` object type definition in [src/externalTypes.ts](src/externalTypes.ts).
 
 #### Example: Adding Postcss
 
@@ -354,6 +329,10 @@ const autoprefixer = require('autoprefixer');
 const cssnano = require('cssnano');
 
 module.exports = {
+  /**
+   * @param {import('tsdx').RollupOptions} config
+   * @param {import('tsdx').TsdxOptions} options
+   */
   rollup(config, options) {
     config.plugins.push(
       postcss({
diff --git a/package.json b/package.json
index 049a344ef..b9e6ee737 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,7 @@
   "bugs": {
     "url": "https://github.com/formium/tsdx/issues"
   },
+  "typings": "./dist/externalTypes.d.ts",
   "bin": {
     "tsdx": "./dist/index.js"
   },
diff --git a/src/externalTypes.ts b/src/externalTypes.ts
new file mode 100644
index 000000000..5cbd5caf5
--- /dev/null
+++ b/src/externalTypes.ts
@@ -0,0 +1,2 @@
+export { RollupOptions } from 'rollup';
+export { TsdxOptions } from './types';
diff --git a/src/types.ts b/src/types.ts
index e6878897e..600eeb331 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -1,9 +1,9 @@
 interface SharedOpts {
-  // JS target
+  /** JS target */
   target: 'node' | 'browser';
-  // Path to tsconfig file
+  /** Path to tsconfig file */
   tsconfig?: string;
-  // Is error extraction running?
+  /** Is error extraction running? */
   extractErrors?: boolean;
 }
 
@@ -33,19 +33,19 @@ export interface NormalizedOpts
 }
 
 export interface TsdxOptions extends SharedOpts {
-  // Name of package
+  /** Name of package */
   name: string;
-  // path to file
+  /** path to file */
   input: string;
-  // Environment
+  /** Environment */
   env: 'development' | 'production';
-  // Module format
+  /** Module format */
   format: ModuleFormat;
-  // Is minifying?
+  /** Is minifying? */
   minify?: boolean;
-  // Is this the very first rollup config (and thus should one-off metadata be extracted)?
+  /** Is this the very first rollup config (and thus should one-off metadata be extracted)? */
   writeMeta?: boolean;
-  // Only transpile, do not type check (makes compilation faster)
+  /** Only transpile, do not type check (makes compilation faster) */
   transpileOnly?: boolean;
 }
 
diff --git a/test/integration/fixtures/build-withConfig/tsdx.config.js b/test/integration/fixtures/build-withConfig/tsdx.config.js
index ba3c055ed..7cd3fdaa3 100644
--- a/test/integration/fixtures/build-withConfig/tsdx.config.js
+++ b/test/integration/fixtures/build-withConfig/tsdx.config.js
@@ -3,6 +3,10 @@ const autoprefixer = require('autoprefixer');
 const cssnano = require('cssnano');
 
 module.exports = {
+  /**
+   * @param {import('tsdx').RollupOptions} config
+   * @param {import('tsdx').TsdxOptions} options
+   */
   rollup(config, options) {
     config.plugins.push(
       postcss({
diff --git a/tsconfig.json b/tsconfig.json
index b1e42b698..fa022b806 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -7,7 +7,7 @@
     "importHelpers": true,
     "esModuleInterop": true,
     "outDir": "dist",
-    "declaration": false,
+    "declaration": true,
     "module": "commonjs",
     "rootDir": "src",
     "strict": true,